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class Command: | |
def redo(self, **kwargs): | |
abstract | |
def undo(self, **kwargs); | |
abstract | |
class UploadImgurCommand extend Command: | |
def redo(self, **kwargs): | |
image = kwargs['image']; | |
try: | |
return imgurApi.upload(image); | |
catch Exception as ex: | |
throw ex; | |
def undo(self, **kwargs): | |
whatever | |
class InsertToMangoCommand extend Command: | |
def redo(self, **kwargs): | |
image_url = kwargs['image_url'] | |
try: | |
return mongoApi.insert(image_url); | |
catch Exception as ex: | |
throw ex; | |
class YourApplication: | |
def upload_image(self, image): | |
command_classes = [UploadImgurCommand, InsertToMangoCommand]; | |
args = { image: image } | |
command_index = 1 | |
for command_class in command_classes: | |
command = command_class(args); | |
try: | |
args = command.redo(args) | |
catch Exception as ex: | |
whatever |
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